The residents of Ucha Ucha used to form giant human cordons to corner the animals and harvest their fine fur, which produces one of the world’s most expensive wools. But motorcycles are ideal on the flat, treeless landscape of Bolivia’s altiplano.

Unprocessed wool from the vicuna, the smallest of the South American camelids, fetches between $300 and $500 a kilogram (about $140-$230 a pound). The fiber is highly prized by the world of fashion, and has been used to make suits for movie stars like Daniel Craig and tycoons like Donald Trump.

Ucha Ucha is 14,800 feet (4,500 meters) above sea level in the Apolobamba nature reserve, 167 miles (269 kilometers) northwest of the Bolivian capital of La Paz. The icy wind and burning sun at this altitude slice and bake the skin of the area’s indigenous residents.

Every two years, about a hundred men and women from Ucha Ucha come together for the biennial vicuna shearing, which lasts four days.

First, they make an offering to the Pachamama (Mother Earth), then the motorcycles herd the animals into a corral made with sticks and netting, where the vicunas are held for about five hours before they are released.

Two men hold each vicuna down while another shears its fur. With luck they can gather 40 kilograms (nearly 90 pounds) of wool in a day.

Ucha Ucha residents say they made about $300 per family in the last shearing in 2011 and expect to make about the same this year.

Vicunas were once hunted to near extinction but now hunting them is forbidden and the Aymara shear and release the animals. The vicuna population has rebounded.

While llamas and alpacas have been domesticated, the vicuna still lives in the wild.